Chuck mechanism for rock drills



Patented Dec. 6, 1938 UNITED STATES G'FFlCiE Ingersoll-Rand Company,

Jer'seS City, N. J.

a corporation of New Jersey Application September 11, 1937,"Serial No. 163,444

9 claims.

reciprocable independently of the ment whereby it is actuated.

One object of the invention element of the percussive eleis to enable that chuck'mechanism which is directly subjected to the wearing action of the working implement to be expeditiously removed from and Other objects will part pointed out hereinafter.

In the drawing accompanying and conveniently inserted into the rock drill. be in part obvious and in this specification and in which similar reference numerals refer to similar parts,

Figure l is an elevation, in

section, of chuck mechanism constructed in accordance with the practice of the invention and the front end of a rock drill to which the invent Figures 2 and 3 are through Figure l spectively, and

ion is applied,

transverse views taken on the lines 2-2 and 3-3, re-

Figures 4 and 5 are views similar to Figure 1 showing other modified forms of the invention.

Referring more particularly to the drawing and at first to the form of the invention illustrated in Figures 1 to 3 inclusively, 23 designates the front end of a rock drill which, for the purpose of this description, may

be assumed to be of the stoper type commonly equipped with pressure actuated feeding mechanism (not shown) for advancing the drill towardthe work in accordance with drilling progress.

The front head shown has a bore 2| of uniform diameter extending from the front end thereof and contains chuck mechanism 22 to accommodate a working implement 23.

More specifically, the chuck prises a chuck sleeve within the front head by any mechanism com- 24 which may be rotated suitable rotation mechanism (not shown) and has a bore 25 comprising enlarged and reducedportions 26 and 21.

The latter portion block 28 serving to transmit serves as a guide for an anvil the blows of the percussive element (not'shown) to the working implement 23.

Preferably, the front end of 24 lies flush with the front head 23, and in the chuck sleeve corresponding end of the the enlarged portion of the bore 25 are a series of longitudinally extending ribs 29 to extend into grooves 3 of a chuck bushing 3 bore 25 In the chuck bushing 3| is extends from one end to the 0 ii in the periphery I inserted slidably into the through the forward end thereof.

a bore 32 which ther of the chuck bushing and is of thesame conformation as the workin'g'implem'ent for which it serves as a bearing. The chuckbus'hing 3| extends exteriorly of the chucksleeve 24 and its periphery, preferably immediately adjacent the front end of the chuck sleeve, is a groove '33 to receive a locking device 34 consisting of two semi-cylindrical membars 35. I

At the ends of the locking device are introverted flanges36 and 31 of which that designated 36 lies in the grove 33 and seats upon the front ends of the front head and the chuck sleeve 24. The flange 31 is accommodated by a groove 38 in the periphery of the front head and the peripheral portion of the front head lying forwardly of the groove 38 constitutes a flange 39 which lies in the space 4|] between the flanges 36 'and'3i to effect interlocking engagement with said flanges.

The flanges 36 and 31 have slide fits with the elements wherewith they interlock, so that they may be easily and quickly placed into position on the rock arm. and are retained in their locking'positio'ns' by a cup-shaped retainer 4| which the skirt 42 encircles the members to prevent disengagement of said members from the chuck bushing and the front head. The end wall 43 of the retainer 4| liesupon the flange 3B and has a bore 44 in slidable engagement with a bearing surface 45 on the periphery of the chuck bushing 3| p g In orderfto prevent endwise movement of the retainer4-l with respect to the locking device 34, a resilient sleeve v46, preferably rubber, is disposed about the front portion of the chuck bushing 3| and seats with its rearward end 41 upon the adjacent end of the retainer 4|. Near the front end of the sleeve '46 is an internal groove 43 to receive a peripheral flange 49 on the chuck bushing 3|. The groove 48 is so located with respect to thev end 41 that when the sleeve occupies its assembled position it will be slightly compressed to maintain the retainer 4| seated firmly upon the locking device 34.

At the front end of the sleeve 46 is verted wall 5|] which overlies the front end of the'chuck bushing 3| and has an aperture 5| to accommodate the working implement 23. The aperture 5| is of the same cross sectional form as the working implement and preferably of slightly smaller area so that when the working implement is inserted into the chuck bushing the walls defining the aperture 5| will snugly engage the surface of the working implement to pre 55 an introthe front end of the chuck sleeve: 52. The memchuck in the casing, and an elastic sleeve encirvent the entrance of abradant into the chuck 68 on the periphery of a chuck bushing 69 slidbushing. ably interlocked with the chuck sleeve 61. The

In practice, Whenever it is intended to remove chuck bushing 69 is retained in assembled posithe chuck bushing 3| for inspection or replacetion by a yieldable element, as for example a from its retaining position. The members 35 are The sleeve is further provided with an in then drawn out of engagement with the groove ternal flange 72 to engage an annular shoulder 33, after which the chuck bushing may be re- 73 on the periphery of the chuck sleeve 61, and 10 moved from the chuck sleeve 24. in the front end of the sleeve 10 is an aperture After a new chuck bushing has been inserted 14 which may frictionally engage the working iminto the chuck sleeve the members 35 are again plement 23 to exclude foreign matter from the placed in looking position and the retainer 4| chuck bushing or, as illustrated, accommodate a against the locking device 34. ioning element to absorb the shocks occasioned end of the rock drill. This is a highly desirable the latter element is projected violently forwardly 25 feature since it renders that portion of the rock against the chuck bushing. Whenever, under drill requiring frequent renewal readily accessisuch circumstances, the anvil block strikes the bushing and related parts are inserted into the immediately contracts and returns the chuck engage the locking device serving to retain sleeve 10 from the shoulder 73 and the chuck the chuck bushing 56 within the chuck sleeve 52. bushing together with the sleeve 10 may then be In this arrangement the chuck bushing carwithdrawn from the chuck sleeve 61.

ries a peripheral flange 5! which seats upon the I claim:

front end of the chuck sleeve 52 with one end 1. In a rock drill, the combination of a casing 40 and engages with its other end an introverted and a working implement, guide means in the flange 58 at the front end of the locking device 55. casing for the working implement extending slid- The locking device is of substantially tubular ab y into t e front end of the s d e st c shape and preferably consists of a pair of semimeans to retain the guide means in the casing.

surface of the groove 63. interloekingly engaging the casing and the chuck At the opposite or front end of the sleeve is a to retain the chuck in the casing, and a sleeve wall havin an aperture 66 t a o d t constructed of elastic material to retain the said the chuck bushing. and a working implement, a chuck in the casing In assembling the chuck mechanism the chuck to guide the Working p ment bushing 56 is first inserted into the chuck sleeve Casing and the chuck, a p ra ty of locking mem- 52 to bring the flange 51 into engagement with bers to engage the shoulders for retaining the bers 59 are then seated against the sides of the Cling the locking members to eta n them in lookchuck sleeve and the chuck bushing to place the 8 engagement W th he Shoulders. flange 60 in the groove 54 and the flange 58 in In a rock drill, the Combination of a Cas position to overlie the front end of the flange 51. and a Wo k ng mplement, a chuck in the casing The rubber sleeve 6! is next placed about the to guide the Working m n Shoulders on the 70 members 59 and the flange in engagement with peripheries of the casing and the chuck, a pluthe groove 63. rality of partly-cylindrical locking members in- In the structure illustrated in Figure 5 the chuck terlockingly engaging the shoulders for retaining sleeve, designated 67, also projects from the front the chuck in the casing, a retainer for holding the head 53 and its end serves as a seat for a flange locking members in locking engagement with the shoulders, and a resilient sleeve on the chuck to hold the retainer in retaining position.

6. In a rock drill, the combination of a casing and a working implement, a chuck in the casing to guide the working implement, shoulders on the peripheries of the casing and the chuck, a plurality of partly-cylindrical locking members interlockingly engaging the shoulders for retaining the chuck in the casing, and an elastic sleeve encir-- cling the locking members to retain said locking members in engagement with the shoulders.

7. In a rock drill, the combination of a casing and a working implement, a chuck in the casing to guide the working implement, shoulders on the casing and the chuck, and means constructed of elastic material interlockingly engaging the shoulders to retain the chuck in the casing.

8. In a rock drill, the combination of a casing and a working implement, a chuck extending slidably into the front end of the casing, and a rubber sleeve interlockingly engaging the casing and the chuck to retain the chuck in the casing.

9. In a rock drill, the combination of a casing and a Working implement, a chuck in the casing to guide the working implement, and a rubber retainer for holding the chuck in the casing.

FRED M. SLATER. 

